PR 18 SOUTHBOUND
Carrying PR 18 SOUTHBOUND over PR 21
5.8 KM N E OF GUAYNABO, San Juan, Puerto Rico
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
PR 18 SOUTHBOUND in San Juan, Puerto Rico sits above 36% of rated Puerto Rico bridges on inventory load rating (29 t), while its 1965 build year is earlier than 70% of San Juan's recorded-year cohort (202 bridges).
PR 18 SOUTHBOUND in San Juan, Puerto Rico is rated Fair in the FHWA's 2024 National Bridge Inventory. Built in 1965, it carries 3 rated components on the inspecting agency's 0-9 scale, and its weakest reported component scores 6. The lowest applicable rating sets the federal condition category, so this Fair result describes the weakest reported component rather than the structure as a whole. No NBI category is a closure decision or a live crossing-safety verdict.
NBI record plate
Structure PR:009592
INTERSTATE-ERA · PRESTRESS · LONG-SPAN-RUN · TIED-CTRL · HEAVY-ADT · STANDARD-LOAD · CAT-FAIR
- INTERSTATE-ERA 1950–1979
- PRESTRESS Prestressed concrete
- LONG-SPAN-RUN 4 spans
- TIED-CTRL Tied control
- HEAVY-ADT Heavy ADT
- STANDARD-LOAD Standard load
- CAT-FAIR Fair
Inspection-sheet codes from this record’s year, material family, spans, controlling component, ADT, inventory load, and NBI category, not a live closure verdict.
Structural health score
A composite of the deck, superstructure, and substructure NBI condition ratings plus the inventory load rating, benchmarked against the full national bridge corpus, distinct from the Good/Fair/Poor category above.
Bridge Snapshot: PR 18 SOUTHBOUND
The PR 18 SOUTHBOUND bridge in San Juan, Puerto Rico carries PR 18 SOUTHBOUND over PR 21. It was built in 1965, making it 61 years old today. It was last reconstructed in 1999, extending its service life. The structure is built primarily of prestressed concrete and spans 4 sections, stretching 76.7 meters (252 feet) end to end. Daily traffic averages 84,550 vehicles, placing it in the heavily-trafficked tier of Puerto Rico bridges. It is owned and maintained by State Highway Agency.
The latest FHWA inspection places the weakest component in fair condition (see the full component ratings below). None of this bridge's reported major components fall into the Poor condition range.
How PR 18 SOUTHBOUND compares
Age against the county: built in 1965, earlier than 142 of San Juan's 202 bridges with a recorded construction year (70%), against a county median build year of 1977. Age is not a defect on its own, but it is the population from which future Poor ratings are drawn.
Live comparison across Puerto Rico bridges with a recorded inventory load rating (2,385 rated).
PR 18 SOUTHBOUND vs every rated Puerto Rico bridge
Inventory load rating (metric tons), FHWA NBI, this state
29 Top 64% higher than 36% of 2,385 bridges
rated Puerto Rico bridges, bucketed by value
Each bar is a band; taller bars hold more bridges. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source FHWA National Bridge Inventory · August 2026
Condition Ratings
Full 0–9 scale + sufficiency-rating breakdown: how condition ratings work.
Reported 0–9 component ratings from the FHWA NBI. The highlighted component is the lowest reported input to this record’s current condition category; it is not a closure or live crossing-safety decision.
San Juan inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 202 bridges in this county. Orthogonal to this structure's component profile above: a county catalog share, not a live crossing-safety verdict.
Structural Details
- Year Built
- 1965
- Last Reconstructed
- 1999
- Material
- Prestressed Concrete
- Number of Spans
- 4
- Structure Length
- 76.7 m (252 ft)
- Deck Width
- 28.4 m (93 ft)
- Owner
- State Highway Agency
- Avg Daily Traffic
- 84,550 vehicles/day
- Structure Number
- 009592
Condition Analysis
- • At 6/9, the deck (driving surface) shows fair condition, with minor wear flagged for upkeep.
- • At 6/9, the superstructure (beams and supports above the deck) shows fair condition, with minor wear flagged for upkeep.
- • At 6/9, the substructure (piers and abutments) shows fair condition, with minor wear flagged for upkeep.
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗How to read this record
This page shows what the last federal inspection recorded, not whether PR 18 SOUTHBOUND is safe to cross today. Here is how to use it.
- NBI condition ratings reflect the latest record in this annual dataset, not a live status. Current routine inspection intervals are risk-based.
- Learn how the 0–9 condition scale and Good/Fair/Poor categories are defined. How condition ratings work
- Compare PR 18 SOUTHBOUND against other structures in San Juan and across Puerto Rico. Puerto Rico bridges
- Noticed visible damage or a safety concern? Report it to the agency that owns the bridge, or call 911 in an emergency. How to report a bridge
Condition codes come straight from the FHWA National Bridge Inventory and are not a real-time safety judgment. Only the owning agency, a state DOT, county, or other owner, can post, restrict, or close a bridge.
Frequently Asked Questions
What do the condition ratings mean for PR 18 SOUTHBOUND?
PR 18 SOUTHBOUND in San Juan, Puerto Rico has a deck rating of 6/9, superstructure rating of 6/9, and substructure rating of 6/9 on the FHWA's 0–9 scale.
How often is PR 18 SOUTHBOUND inspected?
PR 18 SOUTHBOUND's responsible agency sets its routine interval under FHWA's risk-based inspection rules; this page does not expose the scheduled interval. It carries about 84,550 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. PR 18 SOUTHBOUND is currently shown as Fair condition from its component ratings; that category is not a live closure or safety decision.
What is the inventory load rating for PR 18 SOUTHBOUND?
PR 18 SOUTHBOUND has an NBI inventory load rating of 29.1 metric tons.
Who is responsible for maintaining PR 18 SOUTHBOUND?
PR 18 SOUTHBOUND is owned and maintained by State Highway Agency.
How old is PR 18 SOUTHBOUND and does age affect safety?
PR 18 SOUTHBOUND was built in 1965, making it 61 years old and last reconstructed in 1999.
Share this inspection record
Send this source-bounded record or download its data card. An NBI condition category is not a closure or live crossing-safety verdict.
Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. Component ratings, ADT, and condition category on this page are copied from the NBI record for this structure; no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 2024 NBI release. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.